Best Magnesium L-Threonate
The best magnesium l-threonate we track, ranked by real cost-per-dose — not paid placements. Across 7 tracked options the typical dose runs $0.25 per serving.
Prices checked Jun 24, 2026
Best valueSports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption…
$0.003 per serving — the cheapest magnesium l-threonate dose we track.
Full ranking by cost per dose
Cost-per-serving normalizes price across bottle sizes — a 60-count and a 365-count compare fairly.
| # | Product | Form · dose | Servings | Price | $ / serving | $ / 300 mg |
|---|---|---|---|---|---|---|
| 1 | Sports Research® Magnesium L-Threonate Capsules 2000mg… | capsule · 2000mg | 90 | $0.28 | $0.003 | <$0.001 |
| 2 | Life Extension Neuro-Mag Magnesium L-Threonate | capsule · 144mg | 90 | $0.31 | $0.003 | $0.007 |
| 3 | Qunol Q-Mag Magnesium L-Threonate Tablets | tablet · 2000mg | 60 | $0.50 | $0.008 | $0.001 |
| 4 | Magnesium L Threonate, Magtein - NSF Certified - Sleep… | capsule · 2mg | 120 | $29.95 | $0.25 | $37.44 |
| 5 | Source Naturals, Magtein Magnesium L-Threonate, 667 Mg… | capsule · 667mg | 180 | $60.19 | $0.33 | $0.15 |
| 6 | Source Naturals, Magtein Magnesium L-Threonate, 667 Mg… | capsule · 667mg | 90 | $30.79 | $0.34 | $0.15 |
| 7 | Nutricost, Magtein Magnesium L-Threonate, 2000 Mg, 120… | capsule · 2000mg | 120 | $44.96 | $0.37 | $0.06 |
See also: cheapest magnesium l-threonate per dose · Magnesium L-Threonate basics
Frequently asked
What is the best-value Magnesium L-Threonate supplement?+
Sports Research® Magnesium L-Threonate Capsules 2000mg - High-Absorption… — $0.003 per serving ($0.28 for 90 servings), the lowest cost-per-dose magnesium l-threonate in our Amazon US catalog as of June 2026.
What is the typical cost per dose for Magnesium L-Threonate?+
About $0.25 per serving across 7 tracked magnesium l-threonate products, ranging from $0.006 for the best deals to $0.34 for premium options.
What's the cheapest effective Magnesium L-Threonate?+
To reach the commonly-studied 300 mg/day dose, Sports Research® Magnesium L-Threonate Capsules 2000mg… is the best value at <$0.001 per day — cheaper than bottles that look low-priced per serving but are underdosed.